New quote help Growatt

shibli

Hi

Great forum !

I have been provided  the following quote and appreciate if some one can eye ball over please.

Size of system 4.8kh. With battery storage

Equipment;

12 x 400w Hyundai Solar black panels, 25 year warranty to 86.2% efficiency

  1 x Growatt SPH4000  Hybrid inverter and AC/DC Battery storage management system 10 year product warranty

  1 x Growatt GBL16532 6.5kh of battery storage 10 year warranty.

  1 x Solar I Boost water heater

  4 x Tigo optimizers fitted to the panels on the rear of the property

  1 x Emergency power back up supply

  1 x Grid trading option

  1 x All cable run’s isolators and fitting’s

  1 x Micro generation meter

  1 x System Wi Fi monitor  

  1 x System registration

  1 x Access Equipment

  1 x MCS and G98 Certificates

 All service and maintenance under the terms of the warranty.  

Fully fitted price of £8,495.00 This price includes 0% Vat. No extra’s

The company believes its better to place the panels on both the front and rear of the roof as my house is west and east facing for the sun, I also have some shading on the rear roof due to a nearby tree.

My concern is the battery storage, is this sufficient ? My annual usege is around 4400 kwh. For some Growatt is not highly recommended but they are considerably cheaper then solar Edge i was quoted on. I also have a emersion tank so plan to use the solar to provide power. Next 1 to 2 years plan to purchase a EV.

TIA

Solarchaser

At 4400kwh  annually you are borderline for batteries,  they really suit a high user better than medium or low user.

I'm not a fan of growatt due to bad experiences.

East and West does make the most sense, east you will get power in the morning and west in the afternoon. 

The system size is 4.8, but the inverter will only do 3.6... this is very common, just be aware.

My suggestion would be to ditch the batteries, but keep the solar diverter as a more cost effective way to use excess solar and I'd expect to pay £5-5.5k for that.

shibli

Thanks @Solarchaser, what was your bad experience? 

Hopefully planning to use the battery with octopus go tarrif during the winter months. 

Screwdriva

A couple suggestions:

1) Tell Mark not to sell you the cheap stuff. Switch the inverter to Solar Edge with a 25 year guarantee for genuine peace of mind. If that means switching the optimizers/ storage as well, you won't regret it. Growatt has a spotty reputation (I'm being generous).

2) With the orientation you have described, it is likely you will not recover the cost of the iBoost and recommended skipping it. You can always manually trigger your immersion heat via switch on the clearest of days, when you're generating over 3 kW.

3) Panels are excellent. Good choice! 

arty688

Good old light renewables again

I think the quote is good especially under the current circumstances.
The battery decision is up to you financially its borderline although you won't be able to get GO until you have your EV I think.
With your usage you will probably be exporting quite a bit in the summer months so outgoing agile maybe worth a look.
The only think I would add is can you get more panels on the roof ?

arty688

Oh also I asked them about bird protection and they included it at no extra cost so might be worth asking.

shibli

Thanks, @arty688 do you have a similar system ? They originally provided  less panels and added another two. 

@Screwdriva I did ask for a solaredge quote but came out as 12k which makes it a lot more higher.

ggmf

Similar to my install, all working OK at present. Only you can answer if the battery is sufficient,  when do you mostly use your electricity? When my battery is full, I dump the excess generation into the hot water tank (same as you can with the proposed iBoost). With time shifting the use of our appliances, taking worst case, I'm sending very little excess to the grid, its better that we use the generation.

NoobSolar

I think it is a good quote but I am echoing the above posters about most things. I like Light Renewables and they did mine. Personally I would say lose the battery and upgrade to solaredge with optimers on every panel - they are £50 each so that means for £600 more you get one on every panel. Mine are the same hyundai panels you have and they are very good. It will cost quite a bit more for the solaredge HD wave inverter though. Personally I would not opt for a battery until they are a more sensible price.

I don't agree you won't recover the cost of the iboost. I think you will especially with prices where they are. 

It is worth mentioning that supply issues might limit what lots of installers can offer, by the way.

arty688

shibli said:

Thanks, @arty688 do you have a similar system ? They originally provided  less panels and added another two. 

@Screwdriva I did ask for a solaredge quote but came out as 12k which makes it a lot more higher.

Only just paid the deposit on mine, but I had to have Opitimsers on every panel (6 roofs in 3 directions plus shading)so went for Solaredge. Opted for the SE battery as well although new so not much info on them so it may or may not have been a good choice only time will tell. 

it is quite complicated to do the ROI calculations for the iboost from what I have read on this forum  . I didn't have the option so never looked into it.

RisingSun86

Hi Shibli

If it adds any reassurance I have just had a quote for an identical setup. The only difference is I got bird mesh added for free and don’t have the optimisers, but mine is within £100 of yours overall. 

I’m torn on the iboost. I don’t know others opinions but octopus outgoing export prices are some 15p+/kWh vs 7p/kWh for gas, so I’d planned on not turning on the iboost until export prices and gas prices are more evenly matched, notwithstanding the load this takes off your gas boiler.